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What's the highest GPU that this CPU can support?I've got myself a new laptop and I'm giving out my PC to my little brother. He wants to play some games on it, but the Radeon 4850HD is a very outdated GPU. So I'm asking this - What's the most high-end GPU that this CPU (Athlon 5600+ 2.90GHz) can support, without bottlenecking it?

Hardware & Devices

Highest i7 2600K OverclockThe highest everyone seems to have is 4.3 or 4.4 (I can't remember which), hasn't anyone been able to go higher? I heard that it could go up to 5.3 water cooled.

Youtube - Choose highest quality.I have a problem with youtube,
I don't have the option to choose:
"I have a fast connection, always play higher quality video when its available"
what I have is this:

Music, Pictures & Video

UAC returns to highest setting on almost every rebootI usually keep it on the 2nd notch but every time I restart the PC, UAC goes back to the highest setting.
http://i47.tinypic.com/24l7h51.jpg
I'm running Windows 7 Ultimate x64 and I did an upgrade from Vista Ultimate x64
http://i48.tinypic.com/6xw0v6.jpg
Any ideas?